What it's used for
Diphenhydramine is used to temporarily relieve symptoms due to the common cold, hay fever, or other upper respiratory allergies such as runny nose, sneezing, itchy nose or throat, and itchy, watery eyes.
Source: U.S. FDA-approved prescribing information (openFDA).
Typical dosing
Adults and children 12 years and older take 1 caplet every 4 to 6 hours while symptoms persist, up to a maximum of 6 caplets in 24 hours.
Dosing shown here is the general FDA-labeled range. Your prescribing clinician determines the exact dose, form, and schedule for you — this is not a substitute for medical advice.
Boxed warning / key safety info
Do not use this product with any other products containing diphenhydramine, even one used on the skin.
Common side effects
See full FDA prescribing information for the complete adverse reaction profile.
Covered strengths on the Tab $0 list
Covered at $0 with an active Tab membership when filled at a participating pharmacy nationwide or through mail order. A licensed clinician must prescribe the medication.
Related medications
Other allergy, cough & cold medications covered at $0 with an active Tab membership.